Year	Percent
1996-01-01	72.0748
1997-01-01	71.3685
1998-01-01	71.4609
1999-01-01	70.7563
2000-01-01	71.7666
2001-01-01	73.8806
2002-01-01	72.5226
2003-01-01	73.3623
2004-01-01	72.1452
2005-01-01	71.2528
2006-01-01	71.3808
2007-01-01	66.6837
2008-01-01	69.0777
2009-01-01	68.5037
2010-01-01	69.7993
2011-01-01	69.5352
2012-01-01	68.3865
2013-01-01	68.0222
2014-01-01	70.6006
2015-01-01	68.3915
2016-01-01	74.6810